So then I got brave. Yesterday, I decided to pull the trigger and set up my wife’s laptop with Windows 7 RC, and configure her with High DPI so that she wouldn’t change the resolution down to 1024 x 768 any longer. It took her about 10 seconds to find an issue with it.

“Why is everything so tiny on the login screen?”

Ah, yes. One unfortunate side-effect of having High-DPI be a per-user setting is that now you don’t have that setting apply to the login screen any longer. This was clearly unacceptable to my wife, so I had to root around and find some way to fix this. I figured I’d share in case it’s interesting to anyone else.

I went to the key:

HKEY_USERS\.DEFAULT\Control Panel\Desktop

And I added a LogPixels DWORD value, and set it to 0x78 (120 decimal) to set the DPI to 125% (120 DPI) on the login screen. Worked a treat.